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Battery operated remote temperature sensor Drives 4 to 20 mA Current loop:
12/17/04 EDN Design Ideas / (added 1/05) You can remotely measure
temperature using a 4to 20-mA current loop as long as 4000 feet and a
battery-powered, white-light LED driver. You usually configure this equipment to
provide a programmable, constant current to an LED from a battery source.....
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